PHP - [php] Hashing Help

I am currently testing a small hash idea, for say database encryption for passwords.

Basically what I want to know is if this is a good or not the best method for encryption...

Code: [Select]
<?php

    $us_password = 'drowssap'; // User-Submitted Password; 
    $salt = '))!&8d*34d763!(('; //The salt
    $dbs_password = '3750221c513902ff76f4ec7ffed5fa4385d2599d'; // Sha1 hash for "drowssap"+Salt;

        if($us_password == sha1($us_password.$salt)){
            //Some other code for success here
        } else {
           //Failure code here
        }
    
?>

So basically, this is an abstract example of what I'm doing... Is it any good, or what could be improved? I've also used DB-Stored salts unique to each user, so even if someone used rainbow tables ( even after failure on my part for letting them get the hash... ), and multiple users had the same password, they would only crack one, rather than all of them, since the hashes would be different due to the different salts.

Just a quick question.

I have heard a few people say that they store a specific (maybe random) salt string in the same row as the user that is generated when the user account is created or password is changed. But I thought one of the reasons people use hashing is so if someone managed to get hold of the database they couldn't decipher the password (like a simple md5'd string). But putting the salt string next to the username surely gives the attacker a major push in the right direction?

I am not claiming to know anything, I'm just asking because I'm trying to find the best practice (Or at least a good tried and tested one). I like the idea of having a salt in a php config file, because that would mean an attacker would actually have to get your files, and if they had got that far then your pretty much screwed anyway.

Hello

I've recently been made aware that I need to hash the token I use when allowing users to reset their password.

I have a working solution but I'm hoping someone could let me know if this is an adequate way of doing it;

1. User enters their email, I check whether their actually a member and then...     create a passcode (1)     create a salt (2)     hash them together to create a passcode_hash (3)     insert the (2) and (3) into the database     send an email to the user with a link using (1) and the userid in the address 2. When the link is followed...     $_GET the userid and lookup the salt and passcode_hash for that id     hash together the passcode in the URL with the salt, and compare that to passcode_hash     if that is successfull then allow an update of the password (show the update form) 3. The password update form is sent along with two hidden fields (the passcode and userid from the URL)     On the form processing script I perform the same check as on Step 2 to check the passcode and user id have not been messed with     Update the password and delete the passcode Hopefully that makes sense... is that correct?

Here is my code that compares the passcode with the passcode_hash....
 

// get the passcode and email from URL (I will sanitize these)
        $passcode = $_GET['passcode'];
        $member_id = $_GET['uid'];

        // find the salt associated with the userid
        $stmt = $db->prepare("SELECT passcode,salt FROM members_verify WHERE members_id = ?");
        $stmt->bind_param('i',$member_id);
        $stmt->execute();
        $stmt->bind_result($db_passcode,$salt);
        $stmt->fetch();
        $stmt->close();

        // Create salted password
        $passcode_hash = hash('sha512', $passcode . $salt);

        if($passcode_hash===$db_passcode){
            $allowUpdate = 'yes';
        }

Any advice would be great
Edited by paddyfields, 07 June 2014 - 08:18 AM.

I have a large number of files. It is recommended to save the files with hashing system to have fast access to files through the OS. But I have no practical knowledge about hash. Could you please give me a hint, how to save a file with hash coded system via php? and how to read the hash coded filename by php?

Thank you in advance!

<?php 
	function cryptPass($input, $rounds = 9){
	
		$salt = "";
	
		$saltChars = array_merge(range('A','Z'), range('a','z'), range(0,9));
	
		for($i = 0; $i < 22; $i++){
	
			$salt .= $saltChars[array_rand($saltChars)];
	
		}
		
		return crypt($input, sprintf('$2y$%02d$', $rounds) . $salt);
	
	}

	echo $inputPass = "password2";

	echo $pass = "password";

	$hashedPass = cryptPass($pass);

	echo $hashedPass;

	if(crypt($inputPass, $hashedPass) == $hashedPass){
	
		echo "<br /><h1>Password is a match = log user in</h1>";
	
	}else{
	
		echo "<br />Password does not match = do not log in";
	
	}
?>

My PHP version 5.2 When I run above code I am getting the password match answer. I should have get error message. Can anyone advise me . Thank you.

Used to be a good option, but don't know anymore as password_hash() is now available.   Agree?   I understand that I shouldn't ever manually salt and disable the functions salting.  That being said, is there any reason to add a bit extra to the user's password (such as an internal ID and some random constant)?

Hi everyone 

I'm new around here but thought it's about time I joined a good PHP forum! I'll introduce myself properly on the right section, but for now, I'll my post my coding problem on here. I wonder if any has any knowledge or can help.

I'm setting up a connection from my web server to a potential data supplier web server, which involves a load of encryption. One of the stages is generating a SHA1 hash of an encrypted string.

Now I've got some old example code, however the "mhash" function used in this old code appears to obsolete. Thus is doesn't work.

I've tried using the available "sha1" and "hash" functions but cannot replicate the hashed output they provide.

Here's the original code:
Code: [Select]
$encrypted_string = "B0436CBFBC5CAAFB7339AF4A1DF845974D53B9D369146E2E4F1451929D9EBE254363E983F4F94517EB9585FDB112E7B1CCE11A33C5BBA23F8D5DE9D3415BA526489AC796A36FBA76D4293C8DFB673708CED10C9732EEC472D9E43D2626AA104121666E79DD8F2FF6BAC0143BD62E0EE826AF6459779C162613508D48BFE2FC8DD558A1834D7205F96EA8D446E9B371E78E990A3995B1052DCBA9CA0AF99CC77ED2A8B55B2B882BA29D4BB4B07FA91AB4D2F10FBB93732B077335A7E6D96FE813AEDC3711A85CD0C13AE22B28C14FCCE3AF4C1F5D2C0F7697DEC7487CCFC0ED4E77B1B65F39BAD5236E3D3C69D33FC484";

$hashBinaryValue = mhash(MHASH_SHA1, $encrypted_string);
$hashValue = bin2hex($hashBinaryValue);
echo 'hashValue='.$hashValue.'<br>';
The example hashed output should be:
Code: [Select]
31f6d26b18d3c04895cdc2cc05cbd9ad003f2d3e
I cannot seem to replicate this output using the available functions? I've tried the following:
Code: [Select]
$hashBinaryValue = hash('sha1', $encrypted_string);
$hashValue = bin2hex($hashBinaryValue);
And also:
Code: [Select]
$hashBinaryValue = sha1($encrypted_string);
$hashValue = bin2hex($hashBinaryValue);
Both generate:
Code: [Select]
37333736363862393037313732326265346438396433633236383936363430376434613665363231
I've found a webpage that can generate the SHA1 hash, but do not know what language they've done it in.
http://www.fileformat.info/tool/hash.htm?hex=B0436CBFBC5CAAFB7339AF4A1DF845974D53B9D369146E2E4F1451929D9EBE254363E983F4F94517EB9585FDB112E7B1CCE11A33C5BBA23F8D5DE9D3415BA526489AC796A36FBA76D4293C8DFB673708CED10C9732EEC472D9E43D2626AA104121666E79DD8F2FF6BAC0143BD62E0EE826AF6459779C162613508D48BFE2FC8DD558A1834D7205F96EA8D446E9B371E78E990A3995B1052DCBA9CA0AF99CC77ED2A8B55B2B882BA29D4BB4B07FA91AB4D2F10FBB93732B077335A7E6D96FE813AEDC3711A85CD0C13AE22B28C14FCCE3AF4C1F5D2C0F7697DEC7487CCFC0ED4E77B1B65F39BAD5236E3D3C69D33FC484

Any help or input would be greatly appreciated =)